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# Index: O

-O file attribute operator: 5.1.4.3. File attribute checking (Learning the Korn Shell)
O (open line) command: 2.4. More Ways to Insert Text (Learning the vi Editor)
-o option (elvis): 10.11. elvis Futures (Learning the vi Editor)
-o option (vim): 11.2. Important Command-Line Arguments (Learning the vi Editor)
o (other) permission: 3.3.3. Setting Permissions with chmod (Learning Unix)
oawk programming language (see awk programming language)
_ _OBJC_ _ macro[OBJC_ _ macro[: 4.2.2.1. Macros (Mac OS X for Unix Geeks)
object-code libraries: 6.1.3.1. More about C compilers (Learning the Korn Shell)
  C runtime library and: 6.1.3.1. More about C compilers (Learning the Korn Shell)
    6.1.3.1. More about C compilers (Learning the Korn Shell)
object files (see archives; files)
  generating: 2.1. Alphabetical Summary of Commands (Unix in a Nutshell)
  removing information from: 2.1. Alphabetical Summary of Commands (Unix in a Nutshell)
object oriented programming (OOP) in Perl: 41.4. Perl Boot Camp, Part 1: Typical Script Anatomy (Unix Power Tools)
Objective-C programming language, "Hello, World" illustrating: 4.2.5. Frameworks (Mac OS X for Unix Geeks)
objects
  file extension: 1.12. Filename Extensions (Unix Power Tools)
  Python: 42.3.3. Everything's an Object (Unix Power Tools)
    creating: 42.3.3. Everything's an Object (Unix Power Tools)
    file objects: 42.3.5. I/O and Formatting (Unix Power Tools)
  resources in applications, association with: 6.3. X Resource Syntax (Unix Power Tools)
objects, Perl: 41.4. Perl Boot Camp, Part 1: Typical Script Anatomy (Unix Power Tools)
  releasing resources with close( ): 41.4. Perl Boot Camp, Part 1: Typical Script Anatomy (Unix Power Tools)
obsolete commands: B. Obsolete Commands (Unix in a Nutshell)
obtaining
  awk source code: 0.2. Availability of sed and awk (sed & awk)
  commercial awk versions: 11.3.1. MKS awk (sed & awk)
    11.3.2. Thompson Automation awk (tawk) (sed & awk)
    11.3.3. Videosoft VSAwk (sed & awk)
  examples: 0.3. Obtaining Example Source Code (sed & awk)
  gawk source code: 11.2.3. GNU awk (gawk) (sed & awk)
  mawk source code: 11.2.4. Michael's awk (mawk) (sed & awk)
  sample programs: 0.. Sample Programs (sed & awk)
  sed source code: 0.2. Availability of sed and awk (sed & awk)
obtaining source code
  elvis editor: 10.12. Sources and Supported Operating Systems (Learning the vi Editor)
  nvi editor: 9.11. Sources and Supported Operating Systems (Learning the vi Editor)
  vile editor: 12.11. Sources and Supported Operating Systems (Learning the vi Editor)
  vim editor: 11.11. Sources and Supported Operating Systems (Learning the vi Editor)
octal character strings: 4.10. Highlighting and Color in Shell Prompts (Unix Power Tools)
octal dumps, producing: 2.1. Alphabetical Summary of Commands (Unix in a Nutshell)
octal notation: 10.2.1. umask (Learning the Korn Shell)
octal number
  permissions written as: 50.5. Using chmod to Change File Permission (Unix Power Tools)
octal numbers: 7.6. Expressions (sed & awk)
  permissions, writing as: 50.2.1. User, Group, and World (Unix Power Tools)
  values of nonprinting characters: 8.12. Showing Nonprintable Characters in Filenames (Unix Power Tools)
octothorpe (#) for comments: 5.2. Comment (sed & awk)
  7.4.1. Describing Your Script (sed & awk)
  B.2.2.2. Comments (sed & awk)
  #n for suppressing output: 5.2. Comment (sed & awk)
od -c command, displalying nonprintable files: 12.4. Show Nonprinting Characters with cat -v or od -c (Unix Power Tools)
  12.4. Show Nonprinting Characters with cat -v or od -c (Unix Power Tools)
od c command, dumping raw directory contets to screen: 10.2. What's Really in a Directory? (Unix Power Tools)
od command: 2.1. Alphabetical Summary of Commands (Unix in a Nutshell)
  -c option: 14.14. Using unlink to Remove a File with a Strange Name (Unix Power Tools)
offset script: 21.7. offset: Indent Text (Unix Power Tools)
OFMT variable: 7.7. System Variables (sed & awk)
  7.9. Formatted Printing (sed & awk)
OFS variable: 7.7. System Variables (sed & awk)
  7.7. System Variables (sed & awk)
-ok operator (findcommand): 9.9. Running Commands on What You Find (Unix Power Tools)
oldlinks script: 8.16. oldlinks: Find Unconnected Symbolic Links (Unix Power Tools)
OLDPWD shell variable: 4.3.2. Built-in Shell Variables (Unix in a Nutshell)
OLDPWD variable: 3.4.2.10. Miscellaneous variables (Learning the Korn Shell)
  3.5.1. Environment Variables (Learning the Korn Shell)
  4.7. Advanced Examples: pushd and popd (Learning the Korn Shell)
on-disk address of file data blocks: 14.2. How Unix Keeps Track of Files: Inodes (Unix Power Tools)
One-Step (GNU-Darwin auto-installer for OS X): 40.8. The curl Application and One-Step GNU-Darwin Auto-Installer for OS X (Unix Power Tools)
one_stop script (GNU-Darwin), caution before executing: 6.3. GNU-Darwin (Mac OS X for Unix Geeks)
onintr command: 5.8. Built-in C Shell Commands (Unix in a Nutshell)
online documentation (see info command manual pages)
online help
  elvis editor: 10.3. Online Help and Other Documentation (Learning the vi Editor)
  nvi editor: 9.3. Online Help and Other Documentation (Learning the vi Editor)
  vi tutorial: E.1.5. Online vi Tutorial (Learning the vi Editor)
  vile editor: 12.3. Online Help and Other Documentation (Learning the vi Editor)
  vim editor: 11.3. Online Help and Other Documentation (Learning the vi Editor)
online manual (see manpages)
online manual source file extension: 1.12. Filename Extensions (Unix Power Tools)
:only (:on) command (vim): 11.5. Multiwindow Editing (Learning the vi Editor)
open -a command: 1.5.2. Working with File and Directory Names (Mac OS X for Unix Geeks)
open command: 1.5.4. Additional Shell Commands (Mac OS X for Unix Geeks)
  1.6.3. Macintosh Tools (Mac OS X for Unix Geeks)
open command (ex): 9.2. Alphabetical Summary of ex Commands (Unix in a Nutshell)
open files
  file descriptors and: 36.15. Overview: Open Files and File Descriptors (Unix Power Tools)
Open Firmware variables, vram utility for modifying: 8.3.2. nvram (Mac OS X for Unix Geeks)
"[open mode]" message: 1.1.2. Problems Opening Files (Learning the vi Editor)
open mode (elvis): 10.10. Interesting Features (Learning the vi Editor)
opendiff command: B. Command-Line Tools: The Missing Manpages (Mac OS X for Unix Geeks)
opening files: 1.1.1. Opening a File (Learning the vi Editor)
  multiple files at once: 5.5.1. Invoking vi on Multiple Files (Learning the vi Editor)
    5.5.3. Calling in New Files (Learning the vi Editor)
  previous file: 5.5.4. Switching Files from vi (Learning the vi Editor)
  read-only mode: 4.2.2. Read-only Mode (Learning the vi Editor)
  at specific place: 4.2.1. Advancing to a Specific Place (Learning the vi Editor)
OpenSSH: 51.3. Free SSH with OpenSSH (Unix Power Tools)
  Pluggable Authentication Modules (PAM), problems with: 51.5. General and Authentication Problems (Unix Power Tools)
OpenVMS: 1.6.2. Filenames and Wildcards (Learning the Korn Shell)
  1.7.3. Pipelines (Learning the Korn Shell)
  filenames and: 4.5.2.1. Regular expression basics (Learning the Korn Shell)
  multitasking and: 8. Process Handling (Learning the Korn Shell)
openwin command: B.2. Alphabetical Summary of Commands (Unix in a Nutshell)
Opera web browsers: 6.3. Lynx, a Text-based Web Browser (Learning Unix)
operating system, definition of: 0.1. The Unix Family of Operating Systems (Learning Unix)
operating systems
  BSD Unix, versions of make utility: 40.3. Which make? (Unix Power Tools)
  filename wildcards: 33.2. Filename Wildcards in a Nutshell (Unix Power Tools)
    shells emulating operating systems: 33.3. Who Handles Wildcards? (Unix Power Tools)
  graphical interfaces: 1.2. Power Grows on You (Unix Power Tools)
  interoperability: 47.1. Building Bridges (Unix Power Tools)
  POSIX standard for interoprability: 1.3. The Core of Unix (Unix Power Tools)
operating systems, endian order and: 4.3. Architectural Issues (Mac OS X for Unix Geeks)
operators
  ( ) (subshell) operator: 3.3. Shell Setup Files — Which, Where, and Why (Unix Power Tools)
  = (assignment) operator: 41.4. Perl Boot Camp, Part 1: Typical Script Anatomy (Unix Power Tools)
  : (colon), string editing: 28.5. String Editing (Colon) Operators (Unix Power Tools)
  &&: 10.13. Copying Directory Trees with tar and Pipes (Unix Power Tools)
  arithmetic: 36.21.1. Syntax (Unix Power Tools)
  array: 41.5.2. Arrays (Unix Power Tools)
  array-expanding: 9.23.2. Expanding Ranges (Unix Power Tools)
  awk utility: 20.10.4. Operators (Unix Power Tools)
    20.10.4. Operators (Unix Power Tools)
  Boolean: 41.5.1. Scalars (Unix Power Tools)
  in expressions: 32.3. Understanding Expressions (Unix Power Tools)
    precedence of: 32.3. Understanding Expressions (Unix Power Tools)
  for find command: 9.1. How to Use find (Unix Power Tools)
    -exec: 9.9. Running Commands on What You Find (Unix Power Tools)
    -name: 9.4. Looking for Files with Particular Names (Unix Power Tools)
    search operators: 9.6. Be an Expert on find Search Operators (Unix Power Tools)
    time (-mtime, -atime, and -ctime): 9.7. The Times That find Finds (Unix Power Tools)
      9.8. Exact File-Time Comparisons (Unix Power Tools)
  find command, ! and -name: 13.3. Finding Text That Doesn't Match (Unix Power Tools)
  flow-control, for loops in Perl: 41.6. Perl Boot Camp, Part 3: Branching and Looping (Unix Power Tools)
  :gt operator (C shell): 4.14. dirs in Your Prompt: Better Than $cwd (Unix Power Tools)
  if command, awk: 20.10.7. Alphabetical Summary of Commands (Unix Power Tools)
  logical: 36.21.1. Syntax (Unix Power Tools)
  << (here document) operator: 28.13. Here Document Example #1: Unformatted Form Letters (Unix Power Tools)
  numerical: 41.5.1. Scalars (Unix Power Tools)
  parameter substitution (Bourne shell): 36.7. Parameter Substitution (Unix Power Tools)
  precedence of, Boolean operators in Perl: 41.5.1. Scalars (Unix Power Tools)
  redirect and append (>>): 17.12. Appending to an Existing File (Unix Power Tools)
  relational: 36.21.1. Syntax (Unix Power Tools)
    41.5.1. Scalars (Unix Power Tools)
  in shells, listing with definitions: 27.17. "Special" Characters and Operators (Unix Power Tools)
  shift (Perl): 41.4. Perl Boot Camp, Part 1: Typical Script Anatomy (Unix Power Tools)
  string: 4.6. Faster Prompt Setting with Built-ins (Unix Power Tools)
    41.5.1. Scalars (Unix Power Tools)
  string editing: 36.7. Parameter Substitution (Unix Power Tools)
  unmatched: 37.1.2. Unmatched Operators (Unix Power Tools)
operators, awk: B.2.5.6. Operators (sed & awk)
  11.5. Operators (Unix in a Nutshell)
  arithmetic: 7.6. Expressions (sed & awk)
  assignment: 7.6. Expressions (sed & awk)
  Boolean: 7.8. Relational and Boolean Operators (sed & awk)
  postfix versus prefix: 7.6. Expressions (sed & awk)
  relational: 7.8. Relational and Boolean Operators (sed & awk)
operators, C shell: 5.4.1. Operators (Unix in a Nutshell)
Ops (channel operators): 6.7.2.1. Introducing IRC (Learning Unix)
OPTARG shell variable: 4.3.2. Built-in Shell Variables (Unix in a Nutshell)
OPTARG variable: 6.1.3. getopts (Learning the Korn Shell)
/optdirectory: 2.4. Searching Online Manual Pages (Unix Power Tools)
  40.1. /usr/bin and Other Software Directories (Unix Power Tools)
optimization: 5.6. Prebinding (Mac OS X for Unix Geeks)
optimizing disk space: 15.1. Disk Space Is Cheap (Unix Power Tools)
  compressing a directory tree: 15.7. Save Space: tar and compress a Directory Tree (Unix Power Tools)
    fine-tuning: 15.9. Compressing a Directory Tree: Fine-Tuning (Unix Power Tools)
  compressing files: 15.6. Compressing Files to Save Space (Unix Power Tools)
  executable binaries, stripping: 15.10. Save Space in Executable Files with strip (Unix Power Tools)
  limiting files sizes: 15.5. Limiting File Sizes (Unix Power Tools)
  links, using: 15.4. Save Space with a Link (Unix Power Tools)
  quotas on disk usage: 15.11. Disk Quotas (Unix Power Tools)
OPTIND shell variable: 4.3.2. Built-in Shell Variables (Unix in a Nutshell)
OPTIND variable: 6.1.3. getopts (Learning the Korn Shell)
options: 1.5.1. Commands, Arguments, and Options (Learning the Korn Shell)
  3. Customizing Your Environment (Learning the Korn Shell)
  3.3. Options (Learning the Korn Shell)
  2.2. Command-Line Syntax (sed & awk)
  2.3.1. Specifying Simple Instructions (sed & awk)
  (see also under specific option)
  awk: 2.4.3. Summary of Options (sed & awk)
  combining: 2.3.2.3. Mixing options (POSIX) (sed & awk)
  command-line (see command-line options)
  emacs: 2.1. Enabling Command-Line Editing (Learning the Korn Shell)
  keyword: 3.5.1. Environment Variables (Learning the Korn Shell)
  processing with arguments: 6.1.2. Options with Arguments (Learning the Korn Shell)
  sed: 2.3.2.4. Summary of options (sed & awk)
  turning on/off: 3.3. Options (Learning the Korn Shell)
  vi: 2.1. Enabling Command-Line Editing (Learning the Korn Shell)
options for command lines: 1.2. Syntax of Unix Command Lines (Learning Unix)
options, set command: 7.1.1. The :set Command (Learning the vi Editor)
  (see also :set command)
  viewing current: 7.1.1. The :set Command (Learning the vi Editor)
options, set command (list): C. Setting Options (Learning the vi Editor)
options, vi command: 4.2. Options When Starting vi (Learning the vi Editor)
  A. Quick Reference (Learning the vi Editor)
opttest script: 35.24. Standard Command-Line Parsing (Unix Power Tools)
or (-o) operator, case command: 36.25. Testing Two Strings with One case Statement (Unix Power Tools)
OR (||) operator: 7.8. Relational and Boolean Operators (sed & awk)
OR operator: 9.6. Be an Expert on find Search Operators (Unix Power Tools)
  | in extended regular expressions: 32.15. Extended Regular Expressions (Unix Power Tools)
  | (logical OR) operator: 36.21.1. Syntax (Unix Power Tools)
  agrep command, searching for multiple patterns: 13.6. Approximate grep: agrep (Unix Power Tools)
  evaluating OR expressions: 9.12. Finding Many Things with One Command (Unix Power Tools)
OR operator (||): 20.10.2.1. Patterns (Unix Power Tools)
  28.16. Separating Commands with Semicolons (Unix Power Tools)
or operator (Boolean or): 41.5.1. Scalars (Unix Power Tools)
order of operations: 3.1. That's an Expression (sed & awk)
  commands in scripts: 4.1. Applying Commands in a Script (sed & awk)
OroborOSX: 9.2. Running XDarwin (Mac OS X for Unix Geeks)
  9.5. Making X11 Applications More Aqua-like (Mac OS X for Unix Geeks)
  installing, caution with: 9.5.1. An Aqua-like X11: OroborOSX (Mac OS X for Unix Geeks)
orphans: 8.3.3.2. BSD (Learning the Korn Shell)
  8.5. Coroutines (Learning the Korn Shell)
  24.7.2. BSD (Unix Power Tools)
ORS variable: 7.7. System Variables (sed & awk)
  7.7.1. Working with Multiline Records (sed & awk)
osascript commands: 1.3.1.2. .command files (Mac OS X for Unix Geeks)
-ot file attribute operator: 5.1.4.3. File attribute checking (Learning the Korn Shell)
other (o) permission: 3.3.3. Setting Permissions with chmod (Learning Unix)
otherfont display mode (elvis): 10.9.2. Syntax Highlighting (Learning the vi Editor)
otherwise case (Pascal-derived languages): 5.3. case (Learning the Korn Shell)
out-of-date links (see symbolic links, stale)
outlinemono option (elvis): 10.6.4. Options (Learning the vi Editor)
output (see input/output standard output)
  2.2. Command-Line Syntax (sed & awk)
  9.9. Running Commands on What You Find (Unix Power Tools)
  buffer, flushing: 11.2.1.3. Flushing buffered output (sed & awk)
  directing to files: 2.3.2.1. Saving output (sed & awk)
    10.5. Directing Output to Files and Pipes (sed & awk)
  directing to pipes: 10.5.1. Directing Output to a Pipe (sed & awk)
  formatting (awk): 7.9. Formatted Printing (sed & awk)
  formatting into columns: 10.6. Generating Columnar Reports (sed & awk)
  saving: 4.3. Testing and Saving Output (sed & awk)
  suppressing: 2.3.2.2. Suppressing automatic display of input lines (sed & awk)
    5.2. Comment (sed & awk)
  testing: 4.3. Testing and Saving Output (sed & awk)
  to terminal: 11.2.1.4. Special filenames (sed & awk)
output modes, setting: 2.1. Alphabetical Summary of Commands (Unix in a Nutshell)
output processing commands (sed): 10.4.3. Input/Output Processing (Unix in a Nutshell)
output redirection operator (> and >>): 5.1. Standard Input and Standard Output (Learning Unix)
output (UNIX), reading into files: 7.2. Executing UNIX Commands (Learning the vi Editor)
output/input redirecting: 5.1. Standard Input and Standard Output (Learning Unix)
overriding event translations: 6.4. X Event Translations (Unix Power Tools)
overstrike mode: 2.3.3.4. Substituting text (Learning the vi Editor)
overwrite mode (Emacs): 19.5. Putting Emacs in Overwrite Mode (Unix Power Tools)
overwriting files: 5.1.1.2. The > operator (Learning Unix)
  27.4. Command Evaluation and Accidentally Overwriting Files (Unix Power Tools)
owner in long formats (ls): 3.1.8. Listing Files with ls (Learning Unix)
ownership, file: 14.2. How Unix Keeps Track of Files: Inodes (Unix Power Tools)
  changing: 2.1. Alphabetical Summary of Commands (Unix in a Nutshell)
  changing with chown function in Perl: 41.8. Perl Boot Camp, Part 5: Perl Knows Unix (Unix Power Tools)
  changing without chown command: 50.15. How to Change File Ownership Without chown (Unix Power Tools)
  determining: 50.3. Who Will Own a New File? (Unix Power Tools)
  directory, setting sticky bit: 50.4. Protecting Files with the Sticky Bit (Unix Power Tools)
  disk quotas and: 50.14. Why Can't You Change File Ownership? (Unix Power Tools)
  groups: 49.6. Groups and Group Ownership (Unix Power Tools)
    50.2.2. Which Group is Which? (Unix Power Tools)
  groups, determining for: 49.5. Group Permissions in a Directory with the setgid Bit (Unix Power Tools)
  permissions: 50.2. Tutorial on File and Directory Permissions (Unix Power Tools)
  remote files, scp -p command and: 51.7. Server and Client Problems (Unix Power Tools)
  security and: 50.1. Introduction to File Ownership and Security (Unix Power Tools)
  user, group, and world: 50.2.1. User, Group, and World (Unix Power Tools)
ownership of files: 2.1. Alphabetical Summary of Commands (Unix in a Nutshell)

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